How to Plumb a Bathtub Drain: A Step-by-Step Guide

Plumbing a bathtub drain may seem like a daunting task, but with the right tools and knowledge, it can be a manageable DIY project. Whether you’re replacing an old drain or installing a new one, understanding the basics of the bathtub drainage system is crucial.

Before you start, make sure you have all the necessary tools and materials, including a new bathtub drain, plumber’s putty, a screwdriver, and a wrench. Choosing the right bathtub drain is also important, as there are different types available depending on the type of tub and the location of the drain.

In this article, we’ll guide you through the process of how to plumb a bathtub drain, from removing the old drain to connecting the new one to the plumbing system. We’ll also provide tips for troubleshooting and additional considerations for different types of tub materials. By following these steps, you can successfully install a new bathtub drain and enjoy a fully functioning tub.

Key Takeaways

  • Understanding the basics of the bathtub drainage system is crucial before starting the plumbing process.
  • Choosing the right bathtub drain and having the necessary tools and materials is important for a successful installation.
  • Following the steps of removing the old drain, installing the new one, and connecting it to the plumbing system will ensure a fully functioning bathtub.

Understanding Bathtub Drainage System

Plumbing a bathtub drain can be a daunting task, but with a little bit of knowledge and some basic tools, it is possible to do it yourself. Before you start, it’s important to understand the various components of a bathtub drainage system.

Bathtub Drain

The bathtub drain is the opening at the bottom of the tub that allows water to flow out. It is typically located in the center of the tub and is connected to the drain line.

Tub Drain

The tub drain is the pipe that connects the bathtub drain to the main drain line. It is usually made of PVC or ABS plastic and is installed underneath the tub.

Overflow Plate

The overflow plate is a cover plate located near the top of the bathtub that prevents water from overflowing. It is connected to the tub drain and is usually held in place with screws.

P-Trap

The P-trap is a curved pipe that is located underneath the tub drain. It is designed to prevent sewer gases from entering the bathroom by trapping water in the bend of the pipe.

Main Drain

The main drain is the pipe that carries wastewater from the bathtub and other fixtures to the sewer or septic system. It is typically located underneath the bathroom floor and is connected to the P-trap.

Plumbing Diagram

A plumbing diagram is a visual representation of the plumbing system in your home. It shows the location of all the fixtures, pipes, and valves and can be useful for troubleshooting and repairs.

Understanding the various components of a bathtub drainage system is essential for plumbing a bathtub drain. By knowing how the system works, you can identify any problems and make repairs or replacements as necessary.

Tools and Materials Required

Plumbing a bathtub drain requires some basic tools and materials. Here is a list of what you need:

  • Tub drain wrench: This is a specialized tool that helps you remove and install the drain. It has a square end that fits into the drain and a handle that allows you to turn it.
  • Screwdrivers: You’ll need both a flathead and a Phillips screwdriver to remove the drain cover and other components.
  • Plumber’s putty: This is a soft, moldable material that you use to create a watertight seal around the drain. It’s essential for preventing leaks.
  • Rubbing alcohol: You’ll use this to clean the area around the drain before applying the plumber’s putty.

Other tools and materials you may need include:

  • Adjustable wrench: This can come in handy if you need to tighten or loosen any fittings.
  • Pliers: You may need these to grip and turn small components.
  • Hacksaw: If you need to cut any pipes or fittings, a hacksaw will do the job.
  • Pipe dope: This is a type of sealant that you can use on threaded fittings to prevent leaks.

Before you start, make sure you have all the necessary tools and materials on hand. This will save you time and frustration later on.

Choosing the Right Bathtub Drain

When it comes to choosing the right bathtub drain, there are a few things to consider. First, you’ll want to make sure that the drain you choose is compatible with the style of bathtub you have. Some common styles of bathtub drains include flip switch, tip-toe, pop-up, and trip lever.

Another important factor to consider is the size of the drain. Most bathtub drains are designed to fit a standard 1.5-inch drainpipe, but it’s important to double-check the size of your existing drain before purchasing a new one.

If you’re looking for a drain that will match the chrome fixtures in your bathroom, you may want to consider a chrome-finished drain. These drains are designed to blend seamlessly with other chrome fixtures, creating a cohesive look in your bathroom.

For those with freestanding bathtubs, a luxury bathtub drain may be the best choice. These drains are often made from high-quality materials and feature unique designs that can enhance the overall look of your bathroom.

In summary, when choosing a bathtub drain, consider the style and size of your bathtub, the finish of your bathroom fixtures, and whether a luxury drain might be the right choice for your freestanding tub. By taking these factors into account, you can ensure that you choose a drain that not only functions well but also looks great in your bathroom.

Removing the Old Bathtub Drain

Before installing a new bathtub drain, the old one must be removed. Here are the steps to remove the old bathtub drain:

  1. Locate the drain stopper: The drain stopper is the part of the drain that’s closed to fill the tub and opened to empty the tub. It is the most visible part of the drain. There’s a variety of bathtub drain stoppers. If your bathtub has a trip lever, lift the lever to open the drain and then remove the stopper. If your bathtub has a lift-and-turn drain, turn the stopper counterclockwise to unscrew it and then remove the stopper.
  2. Remove the overflow plate: The overflow plate is the cover plate on the side of the bathtub that’s opposite the drain. It’s usually held in place by one or two screws. Remove the screws and then pull the plate away from the wall. This will expose the linkage that connects the trip lever to the drain.
  3. Disconnect the linkage: The linkage is a metal rod that connects the trip lever to the drain. It’s usually held in place by a nut or clip. Use pliers to loosen the nut or clip and then pull the linkage out of the drain.
  4. Remove the drain: The drain is held in place by a threaded connection. Use a drain wrench or pliers to turn the drain counterclockwise and loosen it from the drain shoe. If the drain is stuck, you may need to use a drain extractor to remove it. If the drain extractor isn’t enough, you’ll first have to knock it loose using an old chisel to bite into the metal.
  5. Disconnect the water supply lines and pipes: If you’re replacing the entire drain assembly, you’ll need to disconnect the water supply lines and pipes. Turn off the water supply and then use a wrench to loosen the nuts that hold the water supply lines and pipes in place. Once the nuts are loose, pull the lines and pipes away from the drain.

By following these steps, you’ll be able to remove the old bathtub drain and prepare for installing a new one.

Installing the New Bathtub Drain

Installing a new bathtub drain can be a daunting task, but with the right tools and knowledge, it can be a straightforward process. Here are the steps to follow:

  1. Remove the old drain: First, remove the old drain by unscrewing the drain basket from the drain shoe. If it is difficult to remove, use a drain removal tool to loosen it.
  2. Clean the area: Once the old drain is removed, clean the area around the drain shoe and rim thoroughly. Make sure there is no debris or old putty left behind.
  3. Install the new gasket: Place the new gasket on the drain shoe. The gasket provides a watertight seal between the drain and the tub.
  4. Install the new drain basket: Insert the new drain basket into the drain shoe. Tighten it by hand, and then use pliers to secure it further.
  5. Install the new pop-up: Attach the new pop-up to the drain lever and insert it into the drain basket. Make sure it fits securely.
  6. Install the new plunger : Insert the new plunger into the overflow pipe and attach it to the drain lever.
  7. Apply putty: Apply a small amount of plumber’s putty around the rim of the drain basket. This will provide additional sealing.
  8. Tighten the drain basket: Tighten the drain basket securely with pliers. Be careful not to overtighten it, as this can cause damage to the gasket.
  9. Test the drain: Fill the tub with water and check for leaks around the drain. If there are any leaks, tighten the drain basket further.

By following these steps, you can install a new bathtub drain with ease. Remember to take your time and be careful during the process to avoid any damage to the tub or drain components.

Adjusting the Bathtub Stopper Mechanism

If your bathtub drain stopper is not working correctly, it can be a frustrating experience. Luckily, adjusting the stopper mechanism is a relatively simple process that can be done in just a few steps.

Types of Bathtub Stoppers

Before adjusting the stopper mechanism, it’s important to understand the type of stopper you have. There are several types of bathtub stoppers, including pop-up drain stoppers, foot locks, lift-and-turn drain stoppers, and more. Each type of stopper has a different mechanism for operation, so it’s essential to identify the type of stopper you have before attempting any adjustments.

Adjusting the Stopper Mechanism

To adjust the bathtub stopper mechanism, follow these steps:

  1. Remove the stopper from the drain. Depending on the type of stopper, you may need to unscrew it or lift it out of the drain.
  2. Clean the stopper and drain. Use a rag or brush to remove any debris or buildup from the stopper and drain.
  3. Check the linkage. If your stopper has a linkage mechanism, make sure it is connected correctly and functioning correctly.
  4. Adjust the stopper height. If the stopper is not sealing correctly, adjust the height of the stopper by loosening the nut on the linkage and moving the stopper up or down.
  5. Test the stopper. Once you’ve made the necessary adjustments, test the stopper by filling the bathtub with water and checking for leaks.

Conclusion

Adjusting the bathtub stopper mechanism is a simple process that can be done in just a few steps. By identifying the type of stopper and following the proper adjustment procedure, you can ensure that your bathtub drain stopper is working correctly and preventing leaks.

Connecting the Drain to the Plumbing System

Connecting the bathtub drain to the plumbing system is an essential part of the installation process. The drain connects the bathtub to the waste pipe and allows water to flow out of the tub. Here are the steps to follow when connecting the drain to the plumbing system:

  1. Install the drain assembly: The first step is to install the drain assembly. This includes the drain flange, gasket, and drain shoe. The drain flange is the visible part of the drain that sits on top of the tub. The gasket creates a watertight seal between the flange and the tub. The drain shoe is the part of the drain that connects to the waste pipe.
  2. Connect the overflow cover: The overflow cover is a separate piece that sits above the drain and prevents water from overflowing the tub. It usually has a small hole that allows water to flow into the waste pipe. To connect the overflow cover, insert the screws into the holes on the cover and tighten them with a screwdriver.
  3. Install the cleanout plug: The cleanout plug is a small cap that covers a hole in the drain pipe. It allows access to the drain pipe if it becomes clogged. To install the cleanout plug, insert it into the hole in the drain pipe and tighten it with a wrench.
  4. Connect the drain to the waste pipe: The final step is to connect the drain to the waste pipe. This is done using compression nuts and slip nuts. Compression nuts are used to connect the drain shoe to the waste pipe. Slip nuts are used to connect the drain flange to the drain shoe. Tighten the nuts with a wrench to create a watertight seal.

It is important to ensure that all connections are tight and secure to prevent leaks. Once the drain is connected to the plumbing system, test it by filling the tub with water and checking for leaks. If there are any leaks, tighten the connections or replace any damaged parts.

Overall, connecting the drain to the plumbing system is a straightforward process that can be completed with basic plumbing knowledge and tools. By following these steps, you can ensure that your bathtub drain is properly installed and functioning correctly.

Testing and Troubleshooting

Before completing the installation of a bathtub drain, it is important to test and troubleshoot the system to ensure that it is functioning properly. Here are some steps to follow:

Fill Test

To perform a fill test, fill the bathtub with water and let it sit for a few hours. Check the area underneath the bathtub for any signs of leaks. If there are no leaks, drain the water from the tub.

Drain Test

To perform a drain test, fill the bathtub with water and let it drain completely. Check the drain for any signs of clogs or slow draining. If the water drains slowly, try pouring a mixture of hot water and vinegar down the drain to help clear any clogs. If the problem persists, it may be necessary to remove the drain and clean it thoroughly.

Overflow Test

To perform an overflow test, fill the bathtub with water until it reaches the overflow. Check the overflow for any signs of leaks or water seeping through. If there are leaks, it may be necessary to tighten the connections or replace the gasket.

Trip Lever Test

To perform a trip lever test, operate the trip lever to ensure that it is functioning properly. If the trip lever is not working, it may be necessary to adjust or replace the linkage.

DIY or Professional Help

If you encounter any problems during the testing or troubleshooting process, it is important to seek help from a professional plumber. Attempting to fix the problem on your own may result in further damage or injury. However, if you are confident in your abilities, you can attempt to fix the problem yourself by following the manufacturer’s instructions or consulting online resources for plumbing repair.

Additional Considerations for Different Tub Materials

When it comes to plumbing a bathtub drain, the type of tub material can affect the installation process. Here are some additional considerations for different tub materials:

Fiberglass Tubs

Fiberglass tubs are lightweight and affordable, but they can be more challenging to install than other materials. The drain assembly for a fiberglass tub is typically installed before the tub is set in place. It’s important to ensure that the drain assembly is properly aligned and sealed to prevent leaks. Fiberglass tubs may also require additional support underneath to prevent cracking or flexing.

Acrylic Tubs

Acrylic tubs are similar to fiberglass tubs in terms of weight and affordability, but they are more durable and resistant to cracking. The drain assembly for an acrylic tub is also typically installed before the tub is set in place. However, it’s important to avoid over-tightening the drain assembly, as this can cause damage to the tub. Acrylic tubs may also require additional support underneath to prevent flexing.

Pump Tubs

Pump tubs are designed to circulate water for a more relaxing bathing experience. When plumbing a pump tub, it’s important to ensure that the drain assembly is compatible with the pump system. Some pump tubs may require a special overflow drain assembly to accommodate the pump. It’s also important to ensure that the pump and drain assembly are properly aligned and sealed to prevent leaks.

Regardless of the type of tub material, it’s important to follow the manufacturer’s instructions for installation. If you’re unsure about any aspect of the installation process, it’s best to consult a professional plumber.

Frequently Asked Questions

What is the proper slope for a bathtub drain pipe?

The proper slope for a bathtub drain pipe is 1/4 inch per foot, or 2% slope. This slope ensures that the water flows properly and prevents any standing water in the drain pipe.

What is the minimum pipe size required for a bathtub drain?

The minimum pipe size required for a bathtub drain is 1 1/2 inches. This size is sufficient for most bathtubs and ensures proper drainage.

Where should the bathtub drain be located?

The bathtub drain should be located in the center of the bathtub, at the lowest point. This ensures that the water drains properly and prevents any standing water in the bathtub.

How do I remove a bathtub drain?

To remove a bathtub drain, you will need a drain removal tool. Insert the tool into the drain and turn it counterclockwise to loosen the drain. Once the drain is loose, you can remove it by pulling it out of the drain hole.

What tools do I need to install a bathtub drain?

To install a bathtub drain, you will need a drain wrench, a hacksaw, a pipe cutter, a screwdriver, and plumber’s putty. These tools will allow you to properly install the drain and ensure a tight, leak-free seal.

What is the best way to connect a bathtub drain?

The best way to connect a bathtub drain is to use a PVC drain assembly. This type of assembly is easy to install and provides a tight, leak-free seal. Make sure to follow the manufacturer’s instructions carefully to ensure proper installation.